HighCharts. Change options dinamically

HighCharts. Change options dinamically

I set tooltip option enabled = FALSE. I want change it to TRUE when user
clicks on point. How can I do it?
series : [{
data : data,
dataGrouping: {
enabled: false
},
events: {
click: function(e) {
enabledTooltip();
}
}
}],
//.......................
var enabledTooltip = function(){
// what I should write here?
};